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pam_succeed_if — test account characteristics
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
DESCRIPTION
pam_succeed_if.so is designed to succeed or fail authentication based on
characteristics of the account belonging to the user being authenticated or
values of other PAM items. One use is to select whether to load other modules
based on this test.
The module should be given one or more conditions as module arguments, and
authentication will succeed only if all of the conditions are met.
OPTIONS
The following flags are supported:
debug
Turns on debugging messages sent to syslog.
use_uid
Evaluate conditions using the account of the user whose UID the application
is running under instead of the user being authenticated.
quiet
Don't log failure or success to the system log.
quiet_fail
Don't log failure to the system log.
quiet_success
Don't log success to the system log.
audit
Log unknown users to the system log.
Conditions are three words: a field, a test, and a value to test for.
Available fields are user, uid, gid, shell, home, ruser, rhost, tty and service
:
field < number
Field has a value numerically less than number.
field <= number
Field has a value numerically less than or equal to number.
field eq number
Field has a value numerically equal to number.
field >= number
Field has a value numerically greater than or equal to number.
field > number
Field has a value numerically greater than number.
field ne number
Field has a value numerically different from number.
field = string
Field exactly matches the given string.
field != string
Field does not match the given string.
field =~ glob
Field matches the given glob.
field !~ glob
Field does not match the given glob.
field in item:item:...
Field is contained in the list of items separated by colons.
field notin item:item:...
Field is not contained in the list of items separated by colons.
user ingroup group[:group:....]
User is in given group(s).
user notingroup group[:group:....]
User is not in given group(s).
user innetgr netgroup
(user,host) is in given netgroup.
user notinnetgr group
(user,host) is not in given netgroup.
EXAMPLES
To emulate the behaviour of pam_wheel, except there is no fallback to group 0
being only approximated by checking also the root group membership:
auth required pam_succeed_if.so quiet user ingroup wheel:root
Given that the type matches, only loads the othermodule rule if the UID is over
500. Adjust the number after default to skip several rules.
type [default=1 success=ignore] pam_succeed_if.so quiet uid > 500
type required othermodule.so arguments...
AUTHOR
Nalin Dahyabhai <nalin@redhat.com>
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